I was looking for something more simple,
like kernel-based statistical hit profiling – for example: a timer
interrupt that fires at some regular rate, collects the current Program Counter
value, bucket-izes that data and does a symbol lookup
on those buckets when queried. I’ll take a look at LTT to see if I can
get it to work for my purposes.

I sent an email to pcs.support
previously, and Gerado told me there was no patch
available. I’ll check with them again.